Mohamed-Ikbel Boulabiar has written in to report that he and his team at the Interactive Computing Lab in ENAC, Toulouse have been successful in bringing native multi-touch support to Linux. While there is Multi-Pointer X in the mainlinue X.Org server (to be released with X.Org 7.5 / X Server 1.7), there is now multi-touch support to be able to handle gestures and other actions.
This multi-touch support requires the Linux 2.6.30 kernel. How this works right now is by reading the input events, translating them into multi-touch events using simple gesture recognition, and then sending D-Bus messages over to Compiz to produce multi-touch effects. Right now the code is deemed just a proof of concept, but they are currently working on a better implementation. More information on their current Linux multi-touch work is available through the project web-site. Below is a video they had recorded yesterday showing off some of their multi-touch work on Linux.